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A Flea's Fantastic Jump Takes More Than Muscle | Deep Look Ambakisye-Okang Dukuzumurenyi 33 Views • 6 years ago

Before they can bite your cat or dog, these little "itch hikers" make an amazing leap 100 times faster than the blink of an eye. So how do they do it?

DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.---Spring is here, and with it, the start of flea season. With the warming weather, people and their pets are spending more time outside — which increases the chances of bringing home a hungry “itch hiker.”While pet owners curse the tiny insects and look for a way to rid them from their homes, it turns out fleas actually perform some remarkable athletic feats, like jumping 50 times their height — the equivalent of a human jumping 300 feet — or leaping so fast that they take off 100 times faster than the blink of an eye.No larger than a sesame seed and flattened side to side, fleas can slip through fur with ease. Their jump is so fast they seem to simply vanish and reappear somewhere else.“It's there and then it's gone,” said Gregory Sutton, a professor of biomechanics at the University of Lincoln in the United Kingdom.

--- What do flea eggs look like?After feeding on blood, adult fleas mate and lay eggs. The eggs drop out of their host animal’s fur or feathers and into their bedding or nest. The eggs are translucent white and very small. At 0.5mm the eggs are about the size of a grain of salt.

--- Why do fleas bite me?Blood is a protein-rich food for fleas. Adult fleas feed on blood before they can procreate.

--- Why does my dog/cat keep getting fleas?Fleas are nest parasites. Their eggs fall from the host animal into its bedding where they hatch. The worm-like larvae feed on organic debris (including the adult fleas’ feces) in the bedding. They then curl up into a cocoon and undergo metamorphosis into their adult form. Flea baths tend to kill the fleas currently on the pet, but there may still be flea eggs and larvae in the pet’s bedding. When those young fleas mature they may reinfest the pet.

Read the entire article on KQED Science:
https://www.kqed.org/science/1....957872/a-fleas-fanta

For more information:Why do Large Animals Never Actuate Their Jumps with Latch-Mediated Springs? Because They can Jump Higher Without Them. (Gregory P Sutton, Elizabeth Mendoza, Emanuel Azizi, Sarah J Longo, Jeffrey P Olberding, Mark Ilton, Sheila N Patek)https://academic.oup.com/icb/a....rticle/59/6/1609/554

Banana Wars 1921 - US Occupation in Central America for A Fruit Company Ambakisye-Okang Dukuzumurenyi 45 Views • 5 years ago

Sign up for Curiosity Stream and get Nebula bundled in and SAVE 26%: https://curiositystream.com/thegreatwar

US involvement in Central America dated back to the first attempt to build the Panama Canal. And in accordance to the Monroe Doctrine was expanded in the 20th century too. US Marines took part in expeditions in Guatemala, Nicaragua and US naval power was a factor in many disputes like the Coto War between Costa Rica and Panama. With the rise of the United Fruit Company, the US domestic market also influenced decisions in the region.

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» SOURCES
Butler, Smedley, War is a Racket: The Antiwar Classic by America's Most Decorated Soldier, (Los Angeles, CA : Feral House, 2003)

Chapman, Peter, Bananas: How the United Fruit Company Shaped the World, (Edinburgh : Canongate, 2007)

Colby, Elbridge, “The United States and the Coto Dispute between Panama and Costa Rica”, The Journal of International Relations, Vol. 12, No. 3 (Jan., 1922)

De La Pedraja Tomán, René, Wars of Latin America, 1899-1941, (Jefferson, N.C. : McFarland & Co., 2006)

Gilderhus, Mark T, The Second Century: U.S.- Latin American Relations Since 1889, (Wilmington, Delaware : Scholarly Resources Inc, 2000)

Harrison, Benjamin, “The United States and the 1909 Nicaragua Revolution”, Caribbean Quarterly, Vol. 41, No. 3/4 (September-December 1995)

Langley, Lester D, The Banana Wars: United States Intervention in the Caribbean, 1898-1934, (Wilmington, Delaware : Scholarly Resources Inc, 2002)

Leonard, Thomas M. “Search for Security: The United States and Central America in the Twentieth Century”, The Americas, Vol. 47, No. 4 (Apr., 1991)

Moberg, Mark & Striffler, Steve (eds.), Banana Wars: Power, Production and History in the Americas, (Durham, NC : Duke University Press, 2003)

Mobley, Scott, ““By the Force of Our Arms” William D. Leahy and the U.S. Intervention in Nicaragua, 1912”, Federal History, (2019)

Panama Secretary of Foreign Affairs, Controversia de Limites Entre Panama y Costa Rica, Tomo II, (Panama : Imprenta Nacional, 1921)

Schoultz, Lars, Beneath the United States: A History of U.S. Policy toward Latin America, (Cambridge, MA : Harvard University, 2003)

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